.a{
    background-color: black;
}
.a:active
{
    background-color: white;
}
.f{
    background-image: url("https://www.codester.com/static/img/backgrounds/search-bg.jpg");
}
.g{
    background-image: url("https://www.codester.com/static/img/logo.png ");
}
.h{
    background-image: url("https://www.codester.com/static/img/backgrounds/search-bg.jpg");
}
.i{
    background-image: url("https://www.codester.com/static/img/logo.png ");
}
.g
{
    display:none;
}
.h
{
    display:none;
}
.i
{
    display:none;
}
